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AUDIO FORUMS >> Replacement Tubes >> 274B?
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Message started by slappomatt on 03/14/06 at 19:04:32

Title: 274B?
Post by slappomatt on 03/14/06 at 19:04:32

does anyone know if a valve art 274b will work in a zen "C"  ??? also will a 5y3 based rectifier work in a "CS" ? thanks!

Title: Re: 274B?
Post by mullman on 03/14/06 at 20:42:34

Someone had one of those, or maybe a Sophia?

Randy?

Title: Re: 274B?
Post by rayd on 03/14/06 at 21:51:27

I believe this is what you can use in a CS:
274B
5U4
5R4
5AR4
5U4G
5U4GB
GZ32
GZ34
GZ37
CV593?
5V4?

... and possibly the 5Y3 - but I never tried it. Someone please correct me if I am wrong.

Courtesy of Boead from a past forum:
Rectifier tubes for Zen Select:
(Low voltage = mellower, less aggressive)
-25v      5Y3
-15v      5R4, 5R4-G
0         Stock - 5U4-G
0         5U4-G, -GA, -GB [G=800ma-max, GA=900ma-max, GB=1000ma-max]
+5v       GZ32 (Mullards own, 5V4 substitute)
+10v      5V4
+10v      5V4-G
+10v      5V4-GA
+30v      5AR4 / (GZ34)
(Higher voltage = Dynamic, more aggressive)


I think Randy still has a Sophia 274B mesh-plate but I think the thread that discussed it is gone  :(

How'bouta' a WE 274B? I wann'a try one  :D

- Ray

Title: Re: 274B?
Post by slappomatt on 03/14/06 at 22:12:37

yes i was just looking at that thread awhile back. it looks like the 274b wont work in a "c" or so someone stated. i still dont know about the 5y3 in a "CS" but either way its not that big a deal. I dont have a "c" anymore so thats of little matter to me. just wondering as i didnt remember those combinations being mentioned before.

I just ordered a pair of the valve art 274b tubes for my new Select-EX, I deffinaltly prefer the nos rca tubes that grant gave me along with the ruby. I wanted to try one of the jan centron tubes as well but tubeman is out of stock. ill have to wait on those. does anyone know a decent place to get a mullard GZ32 without selling a car or house?

Title: Re: 274B?
Post by rayd on 03/14/06 at 22:28:57


slappomatt wrote on 03/14/06 at 22:12:37:
does anyone know a decent place to get a mullard GZ32 without selling a car or house?


This is the one I have... Lovely tube...

http://www.upscaleaudio.com/product.asp?itemid=255&catid=48

Title: Re: 274B?
Post by crazy bill the eel killer on 03/15/06 at 00:43:30

Hello Slappomat,

I'm going by memory as I haven't looked at the scematic in a while, but I believe if you go to the 5y3 you need to change the cathode bias resistor on the SV83 from 100 ohms to 150 ohms.

http://www.decware.com/Select/select_ownersmanual.pdf

I just remembered. Go to page 11.

Bill                               :D

Title: Re: 274B?
Post by MAC -SteveH on 03/16/06 at 00:02:46

I have a pair of NEW Full Music 274b's I'm willing to sell reasonably.

Title: Re: 274B?
Post by slappomatt on 03/16/06 at 19:26:05

how reasonable? what is the reason you are selling them? i am not familiar with that tube.  ???

Title: Re: 274B?
Post by Caintuck Randy on 03/16/06 at 19:49:23


mullman wrote on 03/14/06 at 20:42:34:
Someone had one of those, or maybe a Sophia?

Randy?


Yep ..... I have both, actually 3 ..... an early production Valve Art, a Sophia solid plate and a Sophia mesh plate.

According to the spec sheet for a 274B, a Zen Select has too much capacitance to make this rectifier happy.  It likes to see a lot less than the 40uf in the Select.  Even so, there are quite a few Select owners that have used a 274B with absolutely no problems ..... myself included.  It has been stated that the tube life might be shortened in a Select.

As to a Zen C, I don't remember reading anything about how well (or not) this would work ..... ???

The thread that originally discussed this was Rectifier tube insanity .....

Randy

Title: Re: 274B?
Post by slappomatt on 03/16/06 at 21:55:42

I read a review of the full music 274b and the designer said that the tube likes to see a first cap value of 10uf or less. the reviewer said his amp ( a handmade 2a3 amp) said he changed this 20uf cap for a 6.8uf cap.

would that be ok to change in the select? and has anyone tried changing it?

Title: Re: 274B?
Post by MAC -SteveH on 03/17/06 at 00:03:33

My 274b's are sold.

Title: Re: 274B?
Post by slappomatt on 03/17/06 at 05:15:16

lol, THAT didnt take long. oh well. y did you sell them if you dont mind me asking?

Title: Re: 274B?
Post by MAC -SteveH on 03/17/06 at 10:23:34

I don't have a Select anymore. TORII MkII.

Title: Re: 274B?
Post by slappomatt on 03/17/06 at 13:32:35

AHHHHHHH.... lucky guy, but then maybe luck didnt have anything to do with it ;)

well i got the Valve Art 274B last night. and it was late so i only got to listen to it for a little bit. didnt sound bad by any means. but it was just radio on the Dynaco. so ill do some more critical listening hopefully tonight.

Title: Re: 274B?
Post by Hotsauce on 03/23/06 at 22:53:59



Thanks SteveH.

John C.


Title: Re: 274B?
Post by MAC -SteveH on 03/23/06 at 22:56:29

How do you like them?

They are amazing looking, no?


ahhhhh - and in mono's too!!!

Title: Re: 274B?
Post by Hotsauce on 03/24/06 at 21:56:46

Its taken me a day to figure out what exactly I'm hearing different.

They give a more pronounced leading edge to sounds, and so they make the amp time much better.  It also sounds slightly more agressive.

Its fast without sounding dry.

John C.


Title: Re: 274B?
Post by serenechaos on 04/11/06 at 16:15:28


rayd wrote on 03/14/06 at 21:51:27:
How'bouta' a WE 274B? I wann'a try one  :D - Ray


I have one of these I need to put on eBay pretty soon; as soon as I can come up with a digital camera.  
I'ts an early one, with engraved lettering.  
Robert

Title: Re: 274B?
Post by D in MA on 04/11/06 at 23:24:53

I have seen true engraved base WE 274B's go for $600!!!!!
WoWzers!

D

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